Battery cell fixing holder and battery pack

Abstract

The present application provides a battery cell fixing holder and a battery pack. The battery cell fixing holder comprises a holder body, the holder body is provided with mounting slots for mounting battery cells, each mounting slot extends in the height direction of the battery cells; and the mounting slots are provided with exhaust holes that are configured to release pressure of the battery cells and are arranged in a staggered manner with explosion-proof valves of the battery cells.

Description

A cell mounting bracket and battery pack

[0001] This application claims priority to Chinese Patent Application No. 202520173021.7, filed with the Chinese Patent Office on January 24, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of lithium battery technology, specifically to a cell fixing bracket and a battery pack. Background Technology

[0003] In related technologies, lithium batteries often contain multiple cells. Currently, cylindrical cells on the market are often arranged vertically and fixed with foam. In related technologies, the explosion-proof valve and the vent hole on the cell fixing bracket are set opposite to each other. Invention Overview

[0004] When a battery cell experiences thermal runaway, the explosion-proof valve opens, and the ejected material is directly ejected from the vent. The ejection speed is fast, and the ejected material is likely to come into contact with other substances. Therefore, when a single battery cell experiences thermal runaway, it can easily affect adjacent battery cells, leading to a short circuit in the battery pack.

[0005] In a first aspect, this application provides a battery cell mounting bracket. The battery cell mounting bracket includes a bracket body, on which a mounting groove is provided for mounting a battery cell, the mounting groove extending along the height direction of the battery cell; the mounting groove is provided with a vent hole, which is used for depressurization of the battery cell and is arranged in a staggered manner with the explosion-proof valve of the battery cell.

[0006] Secondly, this application provides a battery pack. The battery pack includes battery cells and a battery cell mounting bracket, with the battery cells mounted on the battery cell mounting bracket. Beneficial effects

[0007] The battery cell mounting bracket provided in this application, through the setting of the vent hole, allows for pressure relief through the dedicated vent hole when the battery cell experiences thermal runaway. Furthermore, the vent hole and the explosion-proof valve of the battery cell are arranged in a staggered manner to prevent direct spraying when the battery cell experiences thermal runaway, thus ensuring the safety performance of the battery cell.

[0008] The battery pack provided in this application features a dedicated vent for depressurization when a cell experiences thermal runaway. The vent is also staggered from the cell's explosion-proof valve to prevent direct airflow during thermal runaway and ensure the cell's safety performance. Attached Figure Description

[0009] Figure 1 is a perspective view of a battery cell fixing bracket provided in an embodiment of this application.

[0010] Figure 2 is a perspective view of a battery cell fixing bracket provided in an embodiment of this application.

[0011] Figure 3 is a top view of a battery cell fixing bracket provided in an embodiment of this application.

[0012] Figure 4 is a magnified view of a portion of Figure 2A.

[0013] Figure 5 is a magnified view of a portion of Figure 3B.

[0014] Explanation of reference numerals in the attached figures:

[0015] 1. Bracket body; 11. Mounting slot; 12. Welding hole;

[0016] 2. Exhaust vent; 21. First area; 22. Second area;

[0017] 3. Backing strip;

[0018] 4. First connecting part;

[0019] 5. Second connecting part;

[0020] 6. Partition. Embodiments of the present invention

[0021] In a first aspect, this embodiment provides a battery cell fixing bracket, including a bracket body 1;

[0022] The bracket body 1 is provided with a mounting groove 11 for mounting the battery cell, which extends along the height direction of the battery cell; the mounting groove 11 is provided with an exhaust hole 2, which is used to relieve pressure on the battery cell and is arranged in a staggered manner with the explosion-proof valve of the battery cell.

[0023] In this embodiment, the bracket body 1 is configured to install circular battery cells, that is, all mounting slots 11 are configured as circular mounting slots 11.

[0024] With the vent 2, when the battery cell experiences thermal runaway, pressure is released through the dedicated vent 2. The vent 2 and the battery cell's explosion-proof valve are staggered to prevent direct spraying when the battery cell experiences thermal runaway, thus ensuring the battery cell's safety performance.

[0025] Meanwhile, in this embodiment, during installation, multiple battery cells are installed one-to-one in multiple mounting slots 11. Since the multiple mounting slots 11 are arranged in rows and columns, and the vent holes 2 on the multiple mounting slots 11 are arranged at intervals, the multiple battery cells can be completely isolated to form a single channel. When a single battery cell experiences thermal runaway and depressurization, it will not affect adjacent battery cells. This can prevent short circuits in other battery cells caused by thermal runaway of a single battery cell, thus ensuring the safety of the entire battery pack.

[0026] In summary, in the embodiments of this application, by setting multiple independent mounting slots 11 and vent holes 2, independent spaces can be formed, thereby improving the technical problem that thermal runaway of a single cell can easily affect adjacent cells, leading to a short circuit in the entire battery pack.

[0027] In one embodiment, referring to Figures 1 to 3, the mounting groove 11 is provided with multiple vent holes 2, which are located between the two side walls of the mounting groove 11, and the width of the vent holes 2 is smaller than the width of the mounting groove 11. That is, in this embodiment, the vent holes 2 on two adjacent mounting grooves 11 are complementary and interconnected. Therefore, when a cell experiences thermal runaway and pressure is released, it will not affect adjacent cells, thus avoiding short circuits in other cells caused by thermal runaway of a single cell and ensuring the safety of the entire battery pack.

[0028] In one embodiment, referring to FIG4, the vent 2 is at least partially located on the side wall of the mounting groove 11, and a venting gap is provided between the vent 2 and the explosion-proof valve of the battery cell. Accordingly, when the battery cell experiences thermal runaway, the pressure of the battery cell is relieved through the vent 2 located on the side wall, preventing direct airflow during thermal runaway and ensuring the safety performance of the battery cell. At the same time, in this embodiment, since the mounting grooves 11 are all independent and not interconnected, the pressure relief of the battery cell during thermal runaway will not affect other battery cells, avoiding short circuits in other battery cells.

[0029] In one embodiment, referring to FIG4, the vent 2 is at least partially located on the bottom wall of the mounting groove 11, and a venting gap is provided between the vent 2 and the explosion-proof valve of the battery cell. Accordingly, when the battery cell experiences thermal runaway, the pressure of the battery cell is relieved through the vent 2 located on the bottom wall, preventing direct airflow during thermal runaway and ensuring the safety performance of the battery cell. At the same time, in this embodiment, since the mounting grooves 11 are all independent and not interconnected, the pressure relief of the battery cell during thermal runaway will not affect other battery cells, avoiding short circuits in other battery cells.

[0030] In one embodiment, referring to FIG4, the vent 2 includes a first region 21 and a second region 22 that are interconnected. The first region 21 is located on the side wall of the mounting groove 11, and the second region 22 is located on the bottom wall of the mounting groove 11. A venting gap is provided between the first region 21 and the second region 22 and the explosion-proof valve of the battery cell. When the battery cell experiences thermal runaway and pressure relief, pressure is relieved through the first region 21 and the second region 22 to prevent direct spraying during thermal runaway and ensure the safety performance of the battery cell. Since the first region 21 and the second region 22 are located on two different surfaces of the mounting groove 11, pressure relief can be achieved from two directions when the battery cell experiences thermal runaway, thereby accelerating the pressure relief efficiency, avoiding impact on other battery cells, and further ensuring the safety performance of the battery cell.

[0031] In one embodiment, the ratio of the height of the first region 21 to the height of the battery cell along the axial direction is 3:25. Therefore, the height of the first region 21 is sufficient to ensure that the battery cell can smoothly undergo the pressure relief process within the first region 21, thus ensuring the safety of battery use.

[0032] In one embodiment, the mounting groove 11 is circular and is used to mount a circular battery cell. With the center of the battery cell as the center, the arc of the first region 21 is 30°~50°. Therefore, the width of the first region 21 is sufficient to ensure that the battery cell can smoothly achieve the pressure relief process from the first region 21, thus ensuring the safety of battery use.

[0033] In one embodiment, along the axial direction of the battery cell, the ratio of the height of the first region 21 to the height of the battery cell is 3:25; the mounting groove 11 is circular and designed for mounting circular battery cells, with the center of the battery cell as the center, and the arc of the first region 21 is 30°~50°. Therefore, the width and height of the first region 21 are sufficient to ensure that the battery cell can smoothly undergo the pressure release process within the first region 21, ensuring battery safety. In this embodiment, the height of the first region 21 is 6.2mm, and the diameter of the battery cell is 47mm.

[0034] In one embodiment, the ratio of the length of the second region 22 to the width of the cell along the radial direction is 2:5. Therefore, the length of the second region 22 is sufficient to ensure that the cell can smoothly undergo the pressure relief process within the second region 22, thus ensuring the safety of battery use.

[0035] In this embodiment, the length of the second region 22 is 18mm, and the diameter of the battery cell is 47mm.

[0036] In one embodiment, the ratio of the width of the second region 22 to the height of the cell along the axial direction of the cell is 1:10. Therefore, the width of the second region 22 is sufficient to ensure that the cell can smoothly undergo the pressure relief process within the second region 22, thus ensuring the safety of the battery.

[0037] In this embodiment, the width of the second region 22 is 4.3 mm, and the diameter of the battery cell is 47 mm.

[0038] In one embodiment, along the radial direction of the cell, the ratio of the length of the second region 22 to the width of the cell is 2:5; along the axial direction of the cell, the ratio of the width of the second region 22 to the height of the cell is 1:10. Therefore, the length and width of the second region 22 are sufficient to ensure that the cell can smoothly achieve the pressure relief process within the second region 22, thus ensuring the safety of battery use.

[0039] In one embodiment, a battery cell mounting bracket further includes multiple baffles 3, which are mounted on a mounting groove 11 and positioned opposite to the explosion-proof valve of the battery cell. It is understood that in this embodiment, the baffles 3 are located on the bottom wall of the mounting groove 11. With baffles 3 at the bottom of the mounting groove 11, when one of the battery cells experiences thermal runaway and direct impact, the explosion-proof valve opens, and the baffles 3 can block the ejected material from the explosion-proof valve. Therefore, it can prevent the ejected material from contacting other components and causing a short circuit, further improving the safety of the battery pack.

[0040] In one embodiment, the baffle 3 protrudes from the bottom of the mounting groove 11, and the baffle 3 is spaced apart from the explosion-proof valve of the battery cell. This prevents the baffle 3 from obstructing the explosion-proof valve of the battery cell, ensuring that the explosion-proof valve can open in the event of thermal runaway, thereby guaranteeing the safety of the battery cell.

[0041] In one embodiment, a battery cell fixing bracket further includes a first connecting part 4, which is connected to the bracket body 1 and configured to connect to a first module.

[0042] It should also be noted that in other embodiments, the specific type of the first module can be selected according to actual needs, which is highly practical.

[0043] It is understood that in some embodiments, multiple first connecting portions 4 may also be provided on one side of the support body 1.

[0044] In one embodiment, a battery cell fixing bracket further includes a second connecting part 5, which is connected to the bracket body 1 and configured to connect a second module.

[0045] It should also be noted that in other embodiments, the specific type of the second module can be selected according to actual needs, which is highly practical.

[0046] It is understood that in some embodiments, multiple second connecting parts 5 may also be provided on one side of the support body 1.

[0047] In one embodiment, the first connecting part 4 and the second connecting part 5 are connected to the same side of the bracket body 1, and a partition 6 is provided between the first connecting part 4 and the second connecting part 5. In this embodiment, since the first connecting part 4 and the second connecting part 5 are located on the same side, the partition 6 provided between the first connecting part 4 and the second connecting part 5 can prevent interference between the first connecting part 4 and the second connecting part 5, prevent the wire harnesses of different modules from overlapping and causing interference, and ensure the normal use of different modules.

[0048] In addition, in specific settings, the first connecting part 4 and the second connecting part 5 can be set in a stepped shape to further avoid interference after the first connecting part 4 and the second connecting part 5 are connected to the other modules, and to avoid affecting the internal space of the battery.

[0049] It should also be noted that, in specific configurations, the first connecting part 4 and the second connecting part 5 can be provided on one side of the support body, and the first connecting part 4 and the second connecting part 5 can be provided on the other side of the support body; or the first connecting part 4 and the second connecting part 5 can be provided on one side of the support body, and the first connecting part 4 can be provided on the other side of the support body; or the first connecting part 4 and the second connecting part 5 can be provided on one side of the support body, and the second connecting part 5 can be provided on the other side of the support body.

[0050] Of course, in one embodiment, the first connecting part 4 and the second connecting part 5 can also be connected to opposite sides of the bracket body 1. Therefore, it is not necessary to provide a partition 6 on the bracket, and interference between the first connecting part 4 and the second connecting part 5 can be avoided.

[0051] Secondly, this application provides a battery pack, which includes battery cells and a battery cell mounting bracket, with the battery cells mounted on the battery cell mounting bracket.

[0052] This unique battery pack possesses all the beneficial effects of a cell mounting bracket:

[0053] By setting the vent 2, when the battery cell experiences thermal runaway, pressure is released through the dedicated vent 2. The vent 2 and the explosion-proof valve of the battery cell are staggered to prevent direct spraying when the battery cell experiences thermal runaway, thus ensuring the safety performance of the battery cell. At the same time, in this embodiment, multiple battery cells are installed one-to-one in multiple mounting slots 11. Since the multiple mounting slots 11 are arranged in rows and columns, and the vent 2 on the multiple mounting slots 11 are arranged at intervals, multiple battery cells can be completely isolated to form a single channel. When a single battery cell experiences thermal runaway and pressure is released, it will not affect adjacent battery cells, thus preventing short circuits in other battery cells caused by thermal runaway of a single battery cell and ensuring the safety of the entire battery pack.

[0054] In summary, in the embodiments of this application, by setting multiple independent mounting slots 11 and vent holes 2, independent spaces can be formed, thereby improving the technical problem that thermal runaway of a single cell can easily affect adjacent cells, leading to a short circuit in the entire battery pack.

[0055] In one embodiment, the mounting slot 11 has at least two rows, and in order to avoid interference, the vent holes 2 on the adjacent two rows of mounting slots 11 are arranged opposite to each other.

[0056] In one embodiment, referring to FIG5, a busbar is also included. The bottom of the mounting groove 11 has a welding hole 12, which is configured for welding the battery cell to the busbar. Therefore, by creating a hole at the bottom of the mounting groove 11 of the bracket body 1 to prevent air leakage, the welding work between the battery cell and the busbar can be facilitated, thereby avoiding interference from the bracket body 1 to the welding process. In this embodiment, the welding hole 12 is configured for welding the terminal of the battery cell to the busbar.

[0057] In specific settings, the size of the welding hole 12 can be set according to the actual welding area required between the battery cell's terminal and the busbar.

[0058] In one embodiment, the ratio of the maximum width of the welding hole 12 to the diameter of the battery cell along the radial direction is 1:2.

[0059] In this embodiment, the maximum width of the welding hole 12 is 25mm, and the diameter of the battery cell is 47mm.

Claims

1. A battery cell fixing bracket, comprising: The bracket body has a mounting groove for mounting battery cells, which extends along the height direction of the battery cells; the mounting groove has a vent hole for depressurizing the battery cells and is staggered from the explosion-proof valve of the battery cells.

2. The cell fixing bracket according to claim 1, wherein, The mounting slot is provided with multiple slots, and the vent is located between the two side walls of the mounting slot, and the width of the vent is smaller than the width of the mounting slot.

3. A cell fixing bracket according to claim 1, wherein, The vent is located at least partially on the side wall of the mounting groove, and a venting gap is provided between the vent and the explosion-proof valve of the battery cell.

4. A cell fixing bracket according to claim 1, wherein, The vent is located at least partially on the bottom wall of the mounting groove, and an vent gap is provided between the vent and the explosion-proof valve of the battery cell.

5. A cell fixing bracket according to claim 1, wherein, The vent includes a first region and a second region that are interconnected. The first region is located on the side wall of the mounting groove, and the second region is located on the bottom wall of the mounting groove. An venting gap is provided between the first region and the second region and the explosion-proof valve of the battery cell.

6. A cell fixing bracket according to claim 5, wherein, Along the axial direction of the battery cell, the ratio of the height of the first region to the height of the battery cell is 3:25; and / or, the mounting groove is circular and used for mounting circular battery cells, with the center of the battery cell as the center, and the arc of the first region is 30°~50°.

7. A cell fixing bracket according to claim 5, wherein, Along the radial direction of the battery cell, the ratio of the length of the second region to the width of the battery cell is 2:5; and / or, along the axial direction of the battery cell, the ratio of the width of the second region to the height of the battery cell is 1:

10.

8. A battery cell fixing bracket according to any one of claims 1-7, further comprising a plurality of baffles, wherein the plurality of baffles are mounted on the mounting groove and are configured to be opposite to the explosion-proof valve of the battery cell.

9. A cell fixing bracket according to claim 8, wherein, The baffle protrudes from the bottom of the mounting groove, and the baffle is spaced apart from the explosion-proof valve of the battery cell.

10. A battery pack comprising a battery cell and a battery cell mounting bracket as claimed in any one of claims 1-9, wherein the battery cell is mounted on the battery cell mounting bracket.

11. A battery pack according to claim 10, wherein, The mounting slot has at least two rows, and the vent holes on the adjacent rows of mounting slots are arranged opposite to each other.

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